Synergistical Catalysis of TiO₂ and SAPO-34 for Efficient Conversion of CO₂ to C₂H₄

The excessive emission of carbon dioxide (CO 2 ) into the atmosphere has led to a significant global warming crisis. Utilizing bifunctional catalysts, which consist of bimetallic oxides and SAPO-34, for catalyzing the conversion of CO 2 to high-value-added ethylene (C 2 H 4 ) can effectively mitigate this issue. However, this process also produces a substantial number of by-products. Additionally, the use of bimetallics or precious metals increases the catalyst costs. In this study, we propose an innovative synergistic approach by integrating SAPO-34 with TiO 2, enabling both efficient CO 2 capture and its catalytic conversion into C2 hydrocarbons. The system achieved a C 2 H 4 yield of 20 μmol g –1 with a selectivity of 63.5%. Comprehensive characterizations revealed that the 30% TiO 2 /SAPO composite exhibited a higher concentration of oxygen vacancies and a greater percentage of Ti 3+ species. Moreover, the confinement effect of SAPO-34 facilitated the C–C coupling and the formation of C 2 H 4 . This work exemplifies a dual-functional strategy, providing valuable insights for carbon reduction.